Camelcamelcamel - Easily monitor Amazon product prices and get alerts when they drop.
Zoho Inventory - Zoho Inventory is an online inventory management software ideal for small businesses. Simplify your inventory and order operations. Try for FREE!
Fetchee - Fetchee is a free price tracking wish list app that works with all online stores worldwide.
TradeGecko - TradeGecko (now QuickBooks Commerce) is inventory management software for ecommerce and wholesalers - simplify your inventory & order operations with powerful inventory management, multichannel selling, inventory reports and more!
Keepa - Price history charts and the option to be alerted on price drops for all Amazon sites.
Fishbowl Inventory - Fishbowl offers manufacturing and warehouse management solutions for QuickBooks.